Knee brace



FIG. 1 is a first side elevational view of a knee brace, showing our design.

FIG. 2 is a front elevational view of the knee brace thereof;

FIG. 3 is a rear elevational view of the knee brace thereof;

FIG. 4 is second side elevational view of the knee brace thereof;

FIG. 5 is a top view of the knee brace thereof; and,

FIG. 6 is a bottom view of the knee brace thereof.

The broken lines are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a knee brace, as shown and described. 